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Utility-based Downlink Pilot Assignment in Cell-Free Massive MIMO
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering. Ericsson Research.ORCID iD: 0000-0002-6078-835X
Ericsson Research, Ericsson AB.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7599-4367
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

We propose a strategy for orthogonal downlink pilot assignment in cell-free massive MIMO (multiple-input multiple-output) that exploits knowledge of the channel state information, the channel hardening degree at each user, and the mobility conditions for the users. These elements, properly combined together, are used to define a user pilot utility metric, which measures the user's real need of a downlink pilot for efficient data decoding. The proposed strategy consists in assigning orthogonal downlink pilots only to the users having a pilot utility metric exceeding a predetermined threshold. Instead, users that are not assigned with an orthogonal downlink pilot decode the data by using the statistical channel state information. The utility-based approach guarantees higher downlink net sum throughput, better support both for high-speed users and shorter coherent intervals than prior art approaches.

Place, publisher, year, edition, pages
2018.
National Category
Communication Systems Telecommunications Signal Processing
Identifiers
URN: urn:nbn:se:liu:diva-146246OAI: oai:DiVA.org:liu-146246DiVA, id: diva2:1195194
Conference
The 22nd International ITG Workshop on Smart Antennas (WSA 2018)
Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-04-04

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Giovanni, InterdonatoLarsson, Erik G.

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  • en-US
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  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • text
  • asciidoc
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